Process of treating textile material containing cellulose derivatives and product thereof



Fatented E),

stares arena oericfi GMHLLE DEEYFUS, @F NEW YORK, N. Y.

PBOGESS GE TREATING: TEXTILE MATERIAL CQN'I'AINING CELLULOSE DERIVATIVES MID PRODUCT 'rnmnor No Drawing.

This invention relates to process of treating yarns, fabrics or other textile materials containing organic derivatives of cellulose and particularly cellulose acetate in such a a manner whereby the textile material is dyed and its safe ironing point is increased.

7 An object of my invention is to treat textile material containing organic derivatives of cellulose in such a manner that the same is 34m dyed and its safe ironing point is increased simultaneously. v

A. further object of my invention is to treat cellulose acetate fabric witha logwood dye in such a manner that the fabric is dyed black 5 and its safe ironing point increased from 10 to 40 C. a

I have discovered'that if a textile ma terial containing organic derivatives of -cellulose is treated with a logwood dye in a cerg tain manner, it is not only dyed a good fast black but its safe ironing point is materially increased.

In accordance with my invention a textile material, such as yarn or fabric, containing organic derivatives of cellulose is treated with a logwood of suitable concentration and is consequently treated with an oxidizingv so lution.

The textile material may be treated in the 30 form of yarn in hanks or wound on bobbins or other textile packages. The textile mate rial may be also in the form of fabric. The textile material to be treated in accordance with my invention may contain any 35 suitable organic derivative of cellulose such as organic esters of cellulose or cellulose ethers.

Examples of organic esters of cellulose are.

cellulose acetate, cellulose propionate, cellu- "lose formate or cellulose butyrate. Examples 4 of cellulose ethers are ethyl cellulose, methyl cellulose and benzylcellulose. The textile material may consist wholly of any one of the above organic derivatives of cellulosepr may be made up of a mixture of two or more $Fi..,,of these substances. The textile material,

however, need not consist wholly of organic derivatives of cellulose but may contain other fibres. Examples of mixed fabrics that may be treated in accordance with this invention are mixed cellulose acetate and cotton, mixed Application filed June 20,

cellulose acetate and silk, mixed cellulose acetate and wool, etc.

The textile material is first treated with a bath containing any suitable logwood dye of suitable concentration depending on the nature of the logwood dye, thetemperature employed and the depth of color required. An example of a suitable logwood dye for use in my invention is hematine.

After treatment with the solution of the logwood dye, the textile material is treated process of my invention, is dyed a good black that is fast to washing. An important feature of this process is the fact that the safe ironing point, that is the temperature at which the fabric may be ironed, is materially increased; such increase being or 40 C.

The solution may be applied to textile materials in any' suitable manner. Thus if a fabric is to be treated, it may be dyed on the winch,'on the jig, by padding .or even by spraying. In order further to illustrate my invention the following specific example is given.

Ewample in an aqueous solution containing one gram of soap per liter for fifteen minutes at 60 C., and is then dried. The fabric so treated is dyed -a'good black that has ood fastness to washingand acid. The sa e ironing point of this material is raised from 220 C. for the untreated fabric to 240 C. to 260 C. or more for the treated fabric.

The expression organic derivatives of cellulose as used in the specification and hereinafter in the claims is to be construed to mean any organic ester or ether of cellulose.

It is to be understood that the foregoing description is given merely by way of illustration and that many variations may be made therein Without departing from the spirit of my invention.

Having described my invention what I claimand desire to secure by Letters Patent 1s: a

1. The method of simultaneously dyeing and increasing the safe ironing point of textile materials containing cellulose acetate comprising treating the same with a bath containing hematine and then treating with an acid solution containing a bichromate.

2. The method comprising treating a fabric containing cellulose acetate in a bath containing a 7% hematine solution, rinsing the same, and then treating the fabric in a bath containing about 1.25% of sodium bichromate and about 1% acetic acid.

3. The method comprising treating a fabric containing cellulose acetate in a bath containing about 7% hematine solution for about one hour at substantially 75 (3., rinsing the same, and then treating the fabric in a bath containing about 1.25% of sodium bichromate and about 1% acetic acid for about twenty minutes at substantially 60 C.

4. The method of simultaneously dyeing and increasing the safe ironing polnt of textile materials containing organic derivatives of cellulose comprising treating the same in a bath containing a logwood dye and then treating with an acid solution containing a bichromate. v

5. The method comprising treating a fabric containing an organic derivative of cellulose in a bath containing an approximately 7% hematine solution and then treating with an acid solution containing a bichromate.

6. The method comprising treating a fabric containing cellulose acetate in a bath containing an approximately 7% hematine solu tion and then treating with an acid solution containing a bichromate.

In testimony whereof, I have hereunto subscribed my name.

. CAMILLE DREYFUS. 

